Repair and (re)conditioning of compressor and turbine blades by CO2 and Nd:YAG laser radiation

Closed-center process chain and an on-line temperature control for turbine component repair were validated. Laser cladding on turbine components by CO2 and Nd:YAG laser radiation is carried out using powder additive materials of the same sort (e.g. titanium-based alloys: Ti Al6 V4, Ti 6242, Ti 6246 etc. and nickel-based high temperature alloys: In 625, In 718 etc.). Processing basics and specifications like single-stage processing, powder feeding, gas shielding etc. are described. The dependencies of microstructure, epitaxy, micro-porosity, metallurgical bond defects, mixing, geometry of HAZ, geometrical accuracy and roughness on processing parameters like laser power, scanning speed, powder mass flow and gas shielding flow etc. are discussed on selected clads and materials. Applications like repair of blade tips and seals (e.g. Ti Al6 V4, In 718) and generating of whole blades (e.g. stainless steel) are presented.